Walking on Boulders

Who put a rock in my shoe? I feel as if I have a huge flat rock in the arch of my shoe. As I walk, it hurts very much. This pain just began, out of nowhere toward the end of the day yesterday. Here it is, Saturday, I have lots to do, places to go and my foot hurts! Guess it is time to call my nephew who is a masseuse to ask him questions about it. Maybe he can provide the info I need to find relief. I've got to be able to walk.